The Delta plant, consisting of a limestone drying, grinding and bagging facility, was built in 2005. Rock dust for use in the coal mining industry, both bulk and bagged, is produced at the Delta plant.

The Salida plant also consists of a limestone drying, grinding and bagging facility located on an eight-acre site. Rock Dust and ground calcium carbonate is produced in 50-pound bags for use in the coal mining and agriculture industries.